Pipe-coupling



(No Model.)

J.. NoRToN su W. A. MILLA'R.

l PIPE G OUPLING. I No. 393.120. Patented Nv. 201888.

. WITNESSES. INVENTQRS.

N4 PETERS. FlmluLilhDgrlpher. Walhngali, D.C.

Ninni 'mn-ras JOHN NORTON AND WILLIAM A. MILLAR, OF MCKEESPORT, ASSIGNORS OF ONE-THIRD TO THOMAS VALKER, OF PITTSBURG, PENNSYLVANIA.

PIPE-COU-PLING.

SPECIFICATION forming partof Letters Patent No. 393.120, dated 1\1'ove'mloerl 20, 1888.

Application filed February 16, 1888. Serial No.264g2'20. (No model.)

To all whom it 11i/ary concern: Be it known that we, JOHN NORTON and WILLIAM A. MILLAR, of McKeesport, in the county of Alleghenyand State of Pennsylvania, have invented a new and useful Improvement in Pipe-Couplings; and We do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming part of this specication, in which- Figure lis a side view of portions of pipesections provided with my improved coupling device. Fig. 2 is alongitudinal sectional view of the same. Figs. 3 and 4 are end views of the pipe sections and collars fitted thereon. Like letters of reference indicate like parts wherever they occur.

Our improved pipe-coupling device consists of the following parts: metal collars which 2O are shrunk on the ends of the sections of pipe or tubing, which collars are provided with tongue-and-groove or beveled meeting-faces, an outer sleeve adapted to fit over the collars and a portion of the pipe-sections, and a packing or filling of lead or other suitable material, which is cast or packed between the interior of thesleeve and the collars and pipe-sections, as is hereinafter more fully described, and it is especially adapted for use in natural-gas 3C lines, where the gas passes through the pipes under pressure, although we do not desire to limit it to this use, as it may be employed in anysystem of pipe-lines or to any pipe or tub- A ing where a strong tight joint is required. Heretofore in this class of pipe-coupling the pipes or tubing have been placed end to end Within a sleeve, and the lead packing, in a molten state, has been poured into the sleeve, so as to seal the joint. It is also customary to 4o employ a sleeve having an internal annular flange, against which the ends of the pipesections abut. In either case great loss of lead packing frequently occurs, owing to the molten metal flowing into the interior of the 4 5 pipe at the meeting ends,which seldom fit each other uniformly, and, in addition to the loss of material, the pipes are obstructed and an imperfect joint is formed. Another defect in the former system is that the great pressure 5o of the gas is apt to break the sleeve or in other.

ways cause a leak at the joint, owing to the weakness of the pipeline at these points.

The object of' our invention is to remedy these defects by forming closely-fitting meeting faces at the ends of the pipe-sections and 5 5 by re-enforcing the pipe-sections at the joint.

We will now describe our invention, so that others skilled in the art may manufacture and use the same.

In the drawings, a a represent the two pipe- 6o sections of' a line of pipe or tubing. At the ends of these sections are wrought or cast metal collars b b', which are shrunk on the pipe-sections by heating, in the usual manner of shrinking, and are thereby firmly attached thereto. The face of the collar b, which constitutes the female portion of the coupling, is beveled or grooved so as to form a half V- shaped groove, c, while the other collar, which constitutes the male portion of the coupling, 7o is beveled so as to form the tongue d, which tits within the groove c. It will be noticed that the collar b extends slightly beyond the end of the pipesection ci, so that when the faces of the pipe-sections are placed together the grooved or b'eveled portion of the collar b fits over and on the tongue or beveled portion of the collar b.

Although we have shown a half-V groove,

c, and a beveled end, d, in the drawings, we do 8o not desire to limit ourselves to this shape, as any form of closely-fitting tongue and groove may be substituted therefor. Outside of and around the joint formed by the collars b b is a metal sleeve, e, the interior diameter of 8 5 which is slightly larger than the outside diameter of thc collars b b', so as to permit the ends of the pipesections to be easily inserted. This sleeve extends beyond the collars b b, forming a space, f, for the reception of the lead paok- 9o ing, and in the inner face of the sleeve recesses g g are formed,which serve to retain the lead in its place at the extremities of the collars, thus looking the latter securely together and preventing parting of thejoint.

In forming our improved coupling the collars b b' are preferably shrunk on the ends of the pipe-sections and the faces ground smooth before they leave the shop. The sleeve e may also at the same time he tted on the collar b loo and pipe-section a and the lead packing cast within the space f, so as to attach the sleeve to the pipe-section, in which case, when the pipe is laid, it is only necessary to place the pipe-section a, having the collar b, within the open end ofthe sleeve c and close thejoint by pouring iu the molten metal. If desired, however, the collars b b may be shrunk on the ends of thepipe-sections and the sleeve fitted when the pipe is being laid. In either case the closely-fitting faces of the collars, which lit one within the other, e'l'ectually prevent the lead or other packing material from entering the pipe at thejoint, While at the same time the collars receive the pressure of the gas at the joint and prevent the fracture ofthe sleeve e, which ordinarily is composed of cast-iron.

Having thus described our invention', what We claim,and desire to secure by Letters Pat ent, is-

1. In a pipecoupling, the combination of pipe-sections having collars thereon at their ends, said collars being respectively tongucd and recessed at ltheir abutting ends, whereby they may be fitted together', and an outer sleeve having a packing or calking recess,

` which is around the joint of said collars and is open at theends to permit the introduction of packing or calking material, substantially as and for the purposes described.

2. In a pipe-coupling, the combination of pipe-sections having collars thereon at their ends, said collars being respectively tongued and recessed at their abutting ends, whereby they may be iitted together, and an outer sleeve having a packing or calkiug recess which'is around thejoint of said collars and is open at the ends to permit the introduction of packing or ealking material, said packingrecess extending beyond the rear extremities of the collars and having internal recesses formed in the interior of the sleeve to afford means for retaining the packing or calking material, substantially as and for the purposes described.

In testimony whereof We have hereunto set our hands this 18th day ot' January, A.. D. 1888.

his JOHN NORTON.

mark A fill A. MILLAN. vil messes:

JOHN. W. STEWART, JAMES It. GEMMIL'L. 

